First understand, I am not disagreeing that a wet grass runway makes cross wind landings easier, especially in a tailwheel.
What I do wonder is this...
Is wet grass actually slipperier than dry grass?
The reason I ask is that it does require more runway to take off, and less to land on. And if I kick a football on wet grass it doesn't go as far as it does on dry grass.
So I wonder if it's not a case of the grass actually being "stickier" when wet which makes landing on wet grass better.
I'm not a physicist, and I didn't stay in a Holiday Inn express. So I could be talking out my ears.